JP5046187B2 - Jet bath equipment - Google Patents

Description

  The present invention relates to a jet bath apparatus including a jet nozzle that jets a jet into a bathtub.

Conventionally, there are jet nozzles provided on the bathtub wall, and jets are jetted from the nozzles into the bathtub, but most of them jet jets straight, and jets are part of the bather's body. It was difficult to get a variety of massage feelings because the stimulation received locally by the jet was monotonous and easy to get bored.
Japanese Patent Laid-Open No. 2001-8998 JP-A-2-128765 JP-A-4-61859 Japanese Patent Laid-Open No. 4-176461 JP 2006-150049 A JP 2005-245987 A JP 2004-513 A

  Patent Document 1 discloses a nozzle body in which an outer shape is substantially circular and a jet port provided inside is eccentric from the axial center position and is rotatably accommodated in a unit jet port cover, and water in a bathtub. A nozzle device is disclosed that includes an orifice that injects the nozzle at a predetermined pressure into a jet hole of the nozzle body. Water in the bathtub is injected at a predetermined pressure into the jet hole of the nozzle body through the orifice, mixed with air to become a bubble mixed jet, and jetted into the bathtub from the jet port of the jet hole as a jet jet. At this time, since the jet port of the nozzle body is provided at a position eccentric with respect to the axial center position, the nozzle body is rotated by the jet flow from the orifice, and thereby the rotating jet flow in which the jet direction of the jet jet is changed. Is obtained.

  However, since Patent Document 1 is configured to generate a rotating jet by rotating the nozzle body, the structure for rotatably supporting the nozzle body is complicated and cannot be manufactured at low cost. Furthermore, there is a concern that the rotational performance may be deteriorated due to wear of the rotating sliding portion or clogging of dust.

  Moreover, in patent document 1, the cylindrical attachment member attached with respect to a bathtub wall, and the nested structure where the cylindrical nozzle main body provided rotatably within this attachment member became the double cylinder shape, It has become. Therefore, the structure is complicated, and a narrow gap is formed between the nozzle body corresponding to the inner cylinder and the mounting member corresponding to the outer cylinder, and there is a risk of clogging with dust and the like clogged in the gap. .

  Moreover, in patent document 2, the structure (equivalent to an inner cylinder) which has the guide wall which expands a flow path width gradually toward a downstream in an inner surface, and the structure (equivalent to an outer cylinder) attached to a bathtub wall Between the wall surface, a flow path for returning a part of the flowing water flowing downstream to the upstream side is formed as a narrow gap, and Patent Document 2 also has a double cylinder structure. Therefore, the structure becomes complicated and there is a concern about clogging of a narrow flow path (gap).

  Also, in Patent Document 3, the nozzle has a double cylinder structure. Similarly, the structure is complicated and there is a risk of clogging of a narrow flow path (gap).

  Moreover, in patent document 4, since the motion of a jet is a reciprocating motion, the stimulation range to a human body becomes a linear locus | trajectory, and was not enough as a stimulation range. Furthermore, the jet nozzle disclosed in Patent Document 4 is for jetting bath water into the air, and it can be placed in the bath water in a normal bathing posture such as waist, back, flank, arm, calf, and sole. Some parts of the existing body cannot be stimulated.

  Further, in Patent Document 5, an inlet to the nozzle cylinder is opened in the peripheral wall portion of the nozzle having a single cylinder structure that forms a swirling flow therein, and the main flow flowing into the nozzle cylinder is steady and Forms a powerful swirl flow. For this reason, the jet spouted from the nozzle outlet surface loses its straightness in the axial direction of the cylinder (direction toward the body surface) due to the outstanding centrifugal force, and becomes a jet that spreads uniformly from the entire nozzle outlet surface in the radial direction. It becomes a jet that monotonously stimulates a wide area.

  Also in Patent Document 6, the inlet to the nozzle cylinder is opened in the peripheral wall portion of the nozzle having a single cylinder structure that forms a swirling flow therein, and the jet flow that monotonously stimulates a wide area.

  Also in Patent Document 7, an inlet to the nozzle cylinder is opened in the peripheral wall portion of the nozzle having a single cylinder structure that forms a swirling flow inside, and similarly, the jet is a jet that stimulates a wide range monotonously. End up.

  This invention is made in view of the above-mentioned problem, and provides the jet bath apparatus which can obtain the irritation | stimulation rich in change stably with a simple structure.

In order to achieve the above object, according to the first aspect of the present invention,
A bathtub, a suction opening for receiving bathtub water that is opened in a bathtub wall of the bathtub and stored in the bathtub, a pressurizing device that sucks and pressurizes bathtub water from the suction opening, and the bathtub A jet having a single-layered cylinder that is held against the bathtub wall below the overflow edge, and jets the bathtub water introduced into the cylinder while changing the jetting direction. A jet bath apparatus comprising: a nozzle; and the jet nozzle includes a running water introduction portion, a chamber extending in an axial direction of the cylinder, and formed inside the cylinder, And a mainstream deflector provided upstream of the shield in the chamber, and the flowing water introduction unit is supplied with pressurized bath water sent from the pressurizer. The upstream end and the upstream end are narrower than the upstream end. And having a downstream end communicating with the chamber, the chamber is provided at the upstream end in the axial direction, and the channel cross section is rapidly enlarged with respect to the downstream end of the flowing water introducing portion. And a jet outlet opening at the downstream end in the axial direction and facing the inside of the bathtub, and the shield is provided in the vicinity of the jet outlet. There is provided a jet bath apparatus characterized by blocking a part of a flow path in the chamber leading to an outlet.

  According to the present invention, there is an effect of stably obtaining a variety of stimuli with a simple structure.

Drawing 2 is a mimetic diagram showing a schematic structure of a jet bath device concerning an embodiment of the present invention.
Drawing 3 is a mimetic diagram which looked at a bathtub from the side in the jet bath device.

  As shown in FIG. 2, the jet bath device according to the present embodiment is in the middle of the bathtub 1, the suction port 5 provided in the bathtub wall 3 b of the bathtub 1, the circulation paths 13 and 14, and the circulation paths 13 and 14. And the jet nozzle 11 held against the bathtub wall 4a.

  The bathtub 1 has a pair of long side bathtub walls 3a and 3b facing each other substantially in parallel and a pair of short side bathtub walls 4a and 4b facing each other substantially in parallel.

  The suction port 5 is formed in the long side bathtub wall 3b. When the pump 7 is driven, the bath water (including hot water) stored in the bathtub 1 is sucked into the circulation path 13 through the suction port 5.

  Generally, a bather leans back on one short side bathtub wall (short side bathtub wall 4a in the specific example shown in FIG. 2) of the pair of short side bathtub walls 4a, 4b facing each other, Bathing in a posture in which the foot is directed to the short-side bathtub wall (short-side bathtub wall 4b in the specific example shown in FIG. 2), the bather is formed when the suction port 5 is formed in the short-side bathtub wall. There is a concern that the suction port 5 is blocked by the back or sole of the foot and the pump 7 is overloaded. Therefore, it is desirable to form the suction port 5 in the long side bathtub wall that is not easily blocked by a part of the body of the bather. In addition, in the specific example shown in FIG. 2, although the inlet 5 was formed in the long side bathtub wall 3b, you may form in the long side bathtub wall 3a.

  One end of the circulation path 13 is connected to the suction port 5, and the other end is connected to the suction port of the pump 7. One end of the circulation path 14 is connected to the discharge port of the pump 7, and the other end is connected to the flowing water inlet of the jet nozzle 11. The pump 7 sucks bathtub water into the circulation path 13 from the suction port 5, pressurizes the sucked bathtub water, and discharges it to the circulation path 14 on the downstream side of the pump 7. The pressurized bathtub water discharged from the pump 7 flows into the flowing water inlet of the jet nozzle 11. When not in use, the pump 7 is desirably provided above the suction port 5 in order to drain residual water inside the pump 7.

  In the specific example shown in FIG. 2, two jet nozzles 11 are attached to one short side bathtub wall 4a. The two jet nozzles 11 are substantially the same height (for example, approximately 230 mm from the bottom surface of the bathtub 1) and separated by a predetermined distance (for example, the distance between the two jet nozzles 11 is approximately 160 mm), and the two jet nozzles 11 is provided such that the center of the installation position coincides with the central portion in the direction of the short side bathtub wall 4a. A bathtub-side faucet is provided above the other short-side bathtub wall 4b opposite to the one short-side bathtub wall 4a to which the jet nozzle 11 is attached. Therefore, the bather normally takes a bath with a posture in which the back is directed to the short side bathtub wall 4a on the side where the jet nozzle 11 is provided.

  1 and 4 are schematic cross-sectional views of the jet nozzle 11.

  The jet nozzle 11 roughly includes a cylindrical body 20 that is substantially cylindrical and extends substantially straight, and a curved portion 30 that is provided at an upstream end portion in the axial direction of the cylindrical body 20. The cylindrical body 20 and the bending portion 30 may have an integrally formed structure, or separate members may be combined. Further, the cylindrical body 20 is not limited to a substantially cylindrical shape, and may be a substantially elliptical cylindrical shape.

  A flowing water introduction portion 22 is formed inside the curved portion 30, and a flowing water introduction port 21 connected to the uppermost stream end of the upstream end portion of the flowing water introduction portion 22 outside the circulation path 14 and the bathtub 1 described above. Is formed as an opening. An outlet 26 is formed at the downstream end of the cylindrical body 20 in the axial direction.

  The jet nozzle 11 is held by one short side bathtub wall 4a in the bathtub 1 described above with the jet nozzle 26 facing the inside of the bathtub 1. The jet nozzle 11 is held against the bathtub wall 4 a below the overflow edge of the bathtub 1. Here, the “overflow edge” means the edge (or rim) of the bathtub 1 that first overflows from the bathtub 1 when the bathtub water is accumulated in the bathtub 1. Due to such a configuration, the jet flow from the jet nozzle 11 can be jetted into the bath water.

  The downstream end of the flowing water introduction part 22 functions as a flow path cross-sectional contraction part 23 in which the flow path cross section is most reduced in the flowing water introduction part 22. The most downstream end of the flow path cross-sectional contraction portion 23 opens at the upstream end portion in the axial direction of the cylindrical body 20.

  The flow passage cross section of the flowing water introduction portion 22 is circular or elliptical, and the flow passage cross-sectional area gradually decreases from the upstream end portion toward the flow passage cross-section contraction portion 23 that is the downstream end portion. That is, the flow path of the flowing water introduction portion 22 is gradually narrowed from the upstream end portion toward the flow passage cross-sectional contraction portion 23 that is the downstream end portion.

  The center of the flow path cross section of the flow path cross section contracting portion 23 coincides with the axial center C1 of the cylinder 20. The flow path center line C2 passing through the center of the flow path cross section of the flowing water introduction part 22 draws a curved curve, that is, the flowing water introduction part 22 is curved. The downstream end position of the flow path center line C2 coincides with the axial center C1 of the chamber 25.

  The channel cross-section contraction portion 23 communicates with a chamber 25 formed inside the cylindrical body 20, and the channel cross-section is reduced with respect to the chamber 25. In addition, the flow path cross-section shrinking portion 23 is a straight tube having a constant diameter, extending substantially parallel to the axial direction of the chamber 25 with the center of the flow path cross section being coincident with the axial center C1 of the chamber 25. Is formed. That is, the flow path of the flowing water introduction section 22 is gradually narrowed from the upstream side toward the downstream side, and a straight pipe section (flow path cross-section contraction section 23) having a constant flow path diameter follows the narrowed end. .

  A chamber 25 extending in the axial direction of the cylindrical body 20 is provided inside the cylindrical body 20 between the flow path cross-section contracting portion 23 and the ejection port 26.

  At the upstream end in the axial direction of the chamber 25, there is a channel cross-section rapid enlargement section 24 in which the channel cross section is rapidly enlarged with respect to the channel cross-section contraction section 23 (for example, the diameter is rapidly expanded three times or more) Is provided. The channel cross-section rapid expansion portion 24 communicates with the channel cross-section contraction portion 23 on the downstream side of the channel cross-section contraction portion 23.

  A spout 26 opens at the downstream end of the chamber 25 in the axial direction. The inner wall surface of the chamber 25 extends substantially parallel to the axial center C1 of the chamber 25 from the flow path cross-section rapid enlargement portion 24 to the vicinity of the jet outlet 26. The inner diameter dimension of the portion 24 continues to the vicinity of the ejection port 26. The upstream end portion in the axial direction in the chamber 25 functions as the flow path cross-sectional sudden expansion portion 24, and the downstream end portion in the axial direction in the chamber 25 functions as the ejection port 26.

  The channel wall surface from the channel cross-section contraction portion 23 to the channel cross-section rapid enlargement portion 24 changes substantially vertically. That is, the flow path wall surface of the flow path cross-section contraction portion 23 is substantially parallel to the axial direction of the chamber 25, whereas the upstream end in the axial direction of the chamber 25 that functions as the flow path cross-section sudden expansion portion 24. The wall surface of the portion is formed so as to extend outward in the radial direction following the flow path wall surface of the flow path cross-sectional contraction portion 23. Due to this sudden change in the flow path wall surface, separation of the flow from the wall surface occurs at the flow path cross-sectional sudden expansion portion 24 as will be described later.

  Note that the flow path wall surface of the flow path cross section suddenly expanding portion 24 is not limited to being spread substantially perpendicularly to the flow path wall surface of the flow path cross section contracting portion 23, It may be formed in the shape of a funnel (or a trumpet) in which the diameter of the flow path section increases toward the downstream side to the extent that peeling occurs. However, if the flow path wall surface of the flow path cross-section suddenly expanding portion 24 is formed so as to continue substantially perpendicular to the flow path wall surface of the flow path cross-section contracting portion 23, Easy to promote peeling.

  Further, a shield 50 is provided in the chamber 25 in the vicinity of the ejection port 26 to block a part of the flow path in the chamber 25 that leads to the ejection port 26. The shield 50 is formed in a disk shape, for example, and is provided inside the chamber 25 with its center coinciding with the axial center C1 of the chamber 25.

  The shield 50 is held against the inner wall of the chamber 25 via a plurality of holding members (not shown) provided radially between the shield 50 and the inner wall of the chamber 25, for example. These holding members are provided at equal intervals around the outer peripheral surface of the disk-shaped shield 50 along the circumferential direction. Therefore, the shield 50 does not shield all the flow paths in the chamber 25, and the shield 50 Between the inner wall portion of the chamber 25, a flow path that allows the flow of flowing water from the chamber 25 to the ejection port 26 is secured.

  Inside the chamber 25, a main flow deflecting unit 60 is provided on the axial center C <b> 1 of the chamber 25 on the downstream side of the channel cross-section suddenly expanding portion 24 and on the upstream side of the shield 50. In the present embodiment, the mainstream deflection unit 60 is formed in a disc shape, and is formed integrally with the shield 50 on the upstream side of the shield 50. When formed integrally, it is easier to manufacture and attach than when separately formed. The central axis of the mainstream deflection unit 60 coincides with the central axis of the shield 50, and the outer diameter of the mainstream deflection unit 60 is smaller than the outer diameter of the shield 50. The upstream end of the shield 50 is a flat surface, and the upstream end of the mainstream deflection unit 60 formed integrally with the shield 50 is also a flat surface.

  An annular inclined surface 28 inclined toward the axial center C <b> 1 of the chamber 25 is formed on the inner wall surface continuing to the jet outlet 26 at the downstream end portion in the axial direction of the chamber 25. The inclined surface 28 is inclined so as to gradually approach the axial center C1 from the upstream side toward the downstream side.

  Next, the operation of the jet bath device according to this embodiment will be described.

  2 and 3, when a bather operates a switch of a controller (not shown) provided in the vicinity of the bathtub 1, the pump 7 is activated and the bathtub water stored in the bathtub 1 enters the circulation path 13 from the suction port 5. And inhaled. The sucked bathtub water is pressurized by the pump 7 and introduced into the flowing water inlet 21 of the jet nozzle 11 through the circulation path 14.

  The pressurized bathtub water introduced from the flowing water inlet 21 flows through the flowing water introducing portion 22, and is jetted into the chamber 25 from the flow path cross-sectional contraction portion 23, which is the downstream side end portion, through the flow passage cross-section rapid expansion portion 24. It flows in. When the pressurized bath water flows into the chamber 25 from the flow path cross-section contraction portion 23, it cannot flow along the inner wall surface of the flow path due to the sudden expansion of the cross section of the flow path, and flows against the inner wall surface of the flow path. Peeling occurs.

  A part of the flow collides with the upstream side of the main flow deflection unit 60 to form a pressure rising portion, and the jet itself is bent toward the wall surface as indicated by an arrow C in FIG. Further, the jet accelerates the external fluid by exchanging momentum with the external fluid, and is entrained inside the jet. At this time, if a wall surface exists in the vicinity of the jet, the jet itself is bent toward the wall surface by the reaction of the attractive force that acts to draw the external fluid into the interior. These actions cause the jet itself to follow the wall surface. That is, the flow is reattached to a part of the circumference of the inner wall surface of the chamber 25.

  The main stream adhering to the inner wall surface of the chamber 25 flows along the inner wall surface of the chamber 25 as it is, flows between the outer peripheral surface of the shield 50 and the inner wall surface of the chamber 25 toward the ejection port 26, and before the upstream side of the ejection port 26. A jet stream that inclines with respect to the axial center C1 along the inclined surface 28 that is inclined toward the axial center C1 of the chamber 25 is ejected into the bathtub 1 from the ejection port 26.

  As described above, a main stream (represented by a thick arrow a in FIG. 1) is formed in the chamber 25.

  The flow passage cross section of the jet outlet 26 is larger than the flow passage cross-section contraction portion 23, and the flow is decelerated downstream, that is, a reverse pressure gradient is formed in the chamber 25 where the static pressure increases downstream. Further, since the shield 50 is provided in the chamber 25 so as to block a part of the flow path, a part of the main flow described above is not ejected from the ejection port 26, and is represented by an arrow b in FIG. Returned to the upstream side of the chamber 25.

  The flow returned to the upstream side flows into the stagnation region where the main flow is separated in the vicinity of the channel cross-section sudden expansion portion 24, so that a swirl flow is formed around the central axis C <b> 1 near the channel cross-section sudden expansion portion 24. Thereby, the reattachment position with respect to the flow path wall surface of the main flow changes irregularly in the circumferential direction, and a jet swirled irregularly around the central axis C <b> 1 is ejected from the jet outlet 26. By providing the main flow deflecting unit 60, the main flow is easily reattached to the wall surface of the flow path, and the jet of the irregularly swirling jet is stably generated. Since the central axis of the main flow deflecting unit 60 coincides with the central axis of the chamber 25, the main stream deflecting unit 60 is on the downstream extension of the central axis of the flow path cross-sectional contraction part 23, and there is much flow that has passed through the flow path cross-section contraction part 23. Hit it. The greater the flow, the greater the impact on the flow and the further stability.

  The bather can obtain a massage effect by receiving a swirling jet ejected from the jet nozzle 11 on a part of the body such as the waist, back, shoulders, hands, and feet. The jet jetted from the jet nozzle 11 is a thick and soft swirling jet unlike the generally well-known bubble bath apparatus, so that it wraps around the waist and presses the entire back and waist. You can get a feeling of massage that feels like a hand massage that does not cause strong local stimulation, such as rice cakes, and you can relax and relax without having to get tired even if you take a bath for a long time. In addition, when a strong straight jet is locally received, it tends to be in a tension state in order to maintain a posture to receive the jet at a desired site, but the swirling jet of this embodiment is soft over a wide range. In order to give a stimulus, it is easy to make the bather relaxed without putting tension on the bather.

  Since the jet ejected from the jet nozzle 11 according to the present embodiment is swirling, even if no bubbles are mixed in, a sense of stimulation sufficient to receive a massage feeling can be obtained. Rather, it feels like a massage with a hand massage that is pushed with water that cannot be obtained by mixing bubbles. In addition, since the bubbles are not mixed, the jet sound of the jet and the sound when the bubbles are mixed can be reduced, so that it can be relaxed in a quiet environment. If the pressure in the chamber 25 is lower than the surface of the jet nozzle 26 and the nozzle 11 is mounted at a height as shown in FIG. 3, a negative pressure is generated in the chamber 25, and the chamber wall By providing an air inflow port at any position, it is possible to easily mix bubbles by self-feeding. Therefore, bubbles may be mixed in the swirling jet according to the present embodiment, in which case bubbles are not mixed. The swirl force of the jet is weaker than the case.

  In addition, the jet nozzle 11 according to the present embodiment is configured such that the fluid itself introduced therein excites the swirling of the jet ejected from the jet outlet 26 by the recirculation action in the chamber 25 as described above. Therefore, the rotating and sliding portion as in Patent Document 1 is not required, the nozzle structure is simplified, it can be manufactured at low cost, and maintenance is facilitated. Furthermore, there is no fear of deterioration in turning performance due to wear or dirt clogging at the rotating sliding portion.

  Moreover, as described above, the nozzle of Patent Document 1 has a nested structure in a double cylinder shape. Therefore, the structure is complicated, and a narrow gap is formed between the nozzle body corresponding to the inner cylinder and the mounting member corresponding to the outer cylinder, and there is a risk of clogging with dust and the like clogged in the gap. . Similarly, in Patent Documents 2 and 3, the nozzle has a double cylinder structure. Therefore, the structure becomes complicated and there is a concern about clogging of a narrow flow path (gap).

  On the other hand, in this embodiment, as in Patent Documents 1, 2, and 3, another flow path is not formed as a narrow gap outside the central flow path, and the cylindrical body 20 in which the chamber 25 is formed is a single layer. It is a structure. That is, in a single space (flow path) surrounded by one cylinder 20, a main flow toward the jet outlet 26 and a reflux flowing in a direction opposite to the main flow are formed, and the jet flows as a swirling jet into the bathtub water. Is done. Therefore, the structure is simplified, it can be manufactured at low cost, and maintenance is facilitated. Furthermore, there is no worry of turning performance deterioration due to clogging.

  In addition, as described above, the nozzles of Patent Documents 5, 6, and 7 have a structure in which an inflow port into the nozzle cylinder is opened in the peripheral wall portion of a single-cylinder structure nozzle that forms a swirl flow therein. The main flow flowing into the cylinder forms a steady and powerful swirl flow within the cylinder. For this reason, the jet spouted from the nozzle outlet surface loses its straightness in the axial direction of the cylinder (direction toward the body surface) due to the outstanding centrifugal force, and becomes a jet that spreads uniformly from the entire nozzle outlet surface in the radial direction. It becomes a jet that monotonously stimulates a wide area.

  On the other hand, in this embodiment, the flow path cross-sectional contraction portion 23 that functions as an inlet to the chamber 25 for exciting the swirling flow is not formed on the peripheral wall portion of the cylindrical body 20 surrounding the chamber 25. The chamber 25 opens at the upstream end in the axial direction. Therefore, the main flow that has flowed into the chamber 25 from the channel cross-section contraction portion 23 is peeled off from the channel wall surface at the channel cross-section rapid enlargement portion 24, and then reattaches to the inner peripheral surface of the chamber 25 and travels straight from the outlet 26. It is ejected while maintaining the properties, and further, the position of reattachment to the flow channel wall surface (inner circumferential surface of the chamber 25) of the main flow is changed by the circulating flow (return flow) formed in the chamber 25, Since the direction changes, it is possible to obtain a jet stimulus that is rich in changes such that the stimulation location changes with time.

  In the present embodiment, as described above, the static pressure in the chamber 25 is lower than the static pressure of the bathtub water stored in the bathtub 1, and the reverse pressure in which the static pressure increases toward the downstream side in the chamber 25. Since a gradient is formed, it is possible to form a reflux that returns a part of the main flow to the upstream side of the chamber 25 without providing the shield 50. However, when the shield 50 is provided, the formation of a circulation flow for causing the switching of the jetting jet direction is made as compared with the reflux formation using only the reverse static pressure gradient (the static pressure increases with respect to the flow direction). Since it is stable, the swirl of the jet is stable. That is, the jet swirl direction or the jet movement direction is not easily reversed.

  Even if the inclined surface 28 is not provided, the main flow is biased to a part of the circumference on the inner peripheral surface of the chamber 25 as described above, so that a jet flow deflected with respect to the cylinder axis direction can be realized. As shown in the figure, an inclined surface 28 is provided in front of the upstream side of the jet outlet 26, and the main flow is made to follow the inclined surface 28, whereby the deflection of the main flow can be promoted, and a wider swirling jet is formed. It becomes easy to do.

In the jet nozzle 11 described above, the dimensions L, D, φ _s , φ, h, and φ _CB of the first embodiment shown in FIG. 1 are designed as follows. The length L of the chamber 25 is 76.6 mm, the inner diameter D of the flow path cross section abruptly enlarged portion 24 and the chamber 25 is 27.8 mm, the outer diameter φ _s of the upstream end of the mainstream deflection portion 60 is 11.3 mm, and the shield 50, an outer diameter φ = 12.5 mm of the downstream end portion of the mainstream deflecting portion 60 communicating with the upstream end portion, an axial thickness h = 3.4 mm of the mainstream deflecting portion 60 coinciding with the axial direction of the chamber, and a shield 50 outer diameter φ _CB = 20.9 mm.

  The nozzle material (material of the cylindrical body 20 and the curved portion 30) was made of ABS resin. The jet flow rate of the jet was set to 40 liters / minute per nozzle. In actual production, it is difficult to make all the wall surfaces in the circumferential direction in the straight pipe part to be completely parallel. In view of such circumstances, the straight pipe part is currently in the circumferential direction. It has a changing gradient of about 0 to 1 °.

    FIG. 5 shows a result of comparison between the experimental result of the first embodiment and the experimental result when the mainstream deflection unit is not provided with the turning index K as the vertical axis.

  Here, as an evaluation method of the swirl index K, a tubular rubber film having a thickness of 0.05 mm is attached to the tip of the nozzle 11 (on the jet outlet 26 side), and the rubber film in water accompanying swirling of the jet to be ejected Was shot with a high-speed video camera at 100 frames per second. Then, the positions of both ends of the rubber film in the vertical cross section perpendicular to the central axis of the chamber 25 at a position 50 mm from the nozzle tip are grasped one by one, and the arithmetic average value of both ends of the rubber film is determined from the nozzle tip. The ejection jet center position at the 50 mm position was defined, and the standard deviation value of the temporal change value of the ejection jet center position for 20 seconds was defined as “swirl index K”, which was used as the evaluation performance value. The result is shown in FIG. As the turning performance evaluation value (turning index K) is larger, the center position of the jet is always moving, and the touch width of the jet is larger, so that the turning stability is increased.

  From the result of FIG. 5, it can be seen that the turning index K is larger when the mainstream deflection unit 60 is provided. Since a part of the flow collides with the upstream side of the main flow deflecting unit 60, a pressure rising portion is formed, and the jet itself is bent toward the wall surface due to the pressure difference. Therefore, the main flow deflecting unit 60 is more reattached. It has become easier. That is, the value of the turning index K can be increased by providing the mainstream deflection unit 60.

  The shape of another embodiment of the mainstream deflection unit is shown in FIGS.

FIG. 6 is a front view showing only the mainstream deflection unit 61 and the shield 50 in the second embodiment.
FIG. 7 is a plan view showing only the mainstream deflection unit 62 and the shield 50 in the third embodiment.

The mainstream deflection unit 61 of the second embodiment shown in FIG. 6 has an upstream end that is not a flat surface but a concave shape. The dimensions φ ₁ , h ₁ , h _f of the mainstream deflection unit 61 of the second embodiment shown in FIG. 8 are designed as follows. Representative diameter φ ₁ of the mainstream deflecting portion 61 = 12.7 mm, axial length h ₁ of the mainstream deflecting portion 61 coinciding with the axial direction of the chamber = 3.5 mm, depth of recess from the upstream end of the mainstream deflecting portion 61 H _f = 1.6 mm. Each dimension of the shield 50 of the second embodiment is the same as each dimension of the shield 50 of the first embodiment.

  In the mainstream deflector 62 shown in FIG. 7, the axial center of the mainstream deflector 62 is slightly shifted from the axial center of the shield 50. Each dimension of the mainstream deflection unit 62 is the same as each dimension of the mainstream deflection unit 60 of the first embodiment. Each dimension of the shield 50 according to the third embodiment is the same as each dimension of the shield 50 according to the first embodiment.

  As a result of conducting the same experiment using the second embodiment, the value of the turning index K is larger than that in the case where the mainstream deflecting unit is not provided even if the upstream end is not a flat surface but a concave surface. I understood it. From this result, it can be seen that the shape of the upstream end face of the mainstream deflector does not have to be flat.

As a result of conducting a similar experiment using the third embodiment, even if the central axis of the mainstream deflection unit does not coincide with the central axis of the shield 50, the mainstream deflection unit is on the central axis of the shield 50. It has been found that the value of the turning index K is larger than that in the case where no mainstream deflection unit is provided. From this result, it can be seen that the central axis of the mainstream deflection unit does not have to completely coincide with the central axis of the shield 50.

It is a schematic cross section of a jet nozzle concerning an embodiment of the present invention. The schematic diagram which shows schematic structure of the jet bath apparatus which concerns on embodiment of this invention. The schematic diagram which looked at the bathtub from the side surface direction in the same jet bath apparatus. It is a schematic cross section of a jet nozzle concerning an embodiment of the present invention. It is the result of having compared the experimental result of the present Example 1, and the experimental result when not providing the mainstream deflection | deviation part by making the turning parameter | index K into the vertical axis | shaft. It is the front view which showed only the mainstream deflection | deviation part 61 and the shield 50 in the present Example 2. FIG. It is the top view which showed only the mainstream deflection | deviation part 62 and the shield 50 in the present Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bathtub, 5 ... Suction port, 11 ... Jet nozzle, 20 ... Cylindrical body, 21 ... Flowing water introduction port, 22 ... Flowing water introduction part, 23 ... Channel cross-section contraction part, 24 ... Channel cross-section rapid expansion part, 25 ... Chamber, 26 ... jet port, 28 ... inclined surface, 30 ... curved part, 50 ... shield, 60, 61, 62, ... mainstream deflection part

Claims (2)

A bathtub,
A suction port into which bathtub water that is opened in the bathtub wall of the bathtub and stored in the bathtub is sucked;
A pressurizing device that sucks in, pressurizes, and discharges bath water from the suction port;
It has a single-layered tubular body held against the bathtub wall below the overflow edge of the bathtub, and the bathtub water introduced into the tubular body is placed inside the bathtub while changing the ejection direction. A jet bath device comprising a jet nozzle for jetting,
The jet nozzle includes a running water introduction part, a chamber extending in an axial direction of the cylinder, and formed in the cylinder, a shield provided in the chamber, and the shielding in the chamber A mainstream deflector provided on the upstream side of the body,
The flowing water introduction section includes an upstream end where pressurized bath water sent from the pressurizing device is introduced, and a downstream end where the flow path is narrowed with respect to the upstream end and communicates with the chamber. And
The chamber is provided at an upstream end portion in the axial direction and has a channel cross-section suddenly enlarged portion with respect to the downstream end portion of the flowing water introduction portion, and a downstream side in the axial direction. A spout opening at the end and facing the interior of the bathtub,
The jet bath apparatus characterized in that the shielding body blocks a part of a flow path in the chamber that is provided in the vicinity of the jet port and communicates with the jet port.   The jet bath apparatus according to claim 1, wherein the mainstream deflection unit is formed integrally with the shield.

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